"Two hours before (the window closed) I had a very good offer from Manchester United," Pato told Sportv on Thursday withouut giving any other details of the proposed deal.
The 25-year-old is on loan at Sao Paulo until the end of the year from rivals Corinthians who want to sell him.
He does not want to go back to the club where he spent an unhappy year after returning from AC Milan.
United needed forwards after offloading Robin van Persie, Javier Hernandez and Radamel Falcao in the window.
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They signed Monaco's France international teenager Anthony Martial on the final day of the window for a fee put at 36 million pounds by British media.
Pato has scored nine times in 27 games for Sao Paulo in this season's Paulista state championship.
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(Writing by Andrew Downie; editing by Ken Ferris)
